Trimble Business Center

Let's say I drew a closed loop and wanted to create an offset of that line that increased in elevation at a 1:1 slope that stopped when intersecting with a surface. How could I go about doing that?

I have used the side slope tool in the corridor function, and that works well but isn't applicable with what I'm trying to do right now. Can I do this with just linestrings and offsets?

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Michael Brennan
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Edit:
I nearly forgot. You say you don't want to use sideslope for whatever reason. But what about "Surface Tie"?



With just offsetting lines:
In theory yes, but it depends on the shape and elevation changes on your source line. It will only work perfect if the source line has no grades.

Offset the new line sideways and upwards the same amount with CAD->Offset, above the target surface.
Create a temporary surface from those two lines. Now you'd have to check with the coordinate scroll if the resulting slopes of the triangulation is good enough for you.

Use Surface->Surface Intersect Lines afterwards

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Ronny Schneider
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Thanks for the suggestion.

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Michael Brennan
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Original Message:
Sent: 12-21-2022 16:13
From: Ronny Schneider
Subject: Offset line and snap to surface

Edit:
I nearly forgot. You say you don't want to use sideslope for whatever reason. But what about "Surface Tie"?



With just offsetting lines:
In theory yes, but it depends on the shape and elevation changes on your source line. It will only work perfect if the source line has no grades.

Offset the new line sideways and upwards the same amount with CAD->Offset, above the target surface.
Create a temporary surface from those two lines. Now you'd have to check with the coordinate scroll if the resulting slopes of the triangulation is good enough for you.

Use Surface->Surface Intersect Lines afterwards

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Ronny Schneider
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I think the Surface Tie option that Ronny mentioned will solve this problem for you.  I use this tool frequently for things like overexcavation layback, or landscape slopes.  Just make sure your surfaces are freshly built before you start.

Create Surface Tie, Select the Layer you want the new surface tie to be in, Select the surface that you want to tie in to, Select the reference line and direction, maximum spacing, and then fill in your desired cut/fill slopes (you can opt between a slope percent and ratio using the drop downs). 

This will create a new surface tie surface.  In some cases, it may be appropriate to explode the surface tie so that you can incorporate this linework into a FD surface or specific machine surface model.

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Anthony Dalla
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This worked well, thank you.

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Michael Brennan
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Original Message:
Sent: 12-22-2022 08:39
From: Anthony Dalla
Subject: Offset line and snap to surface

I think the Surface Tie option that Ronny mentioned will solve this problem for you.  I use this tool frequently for things like overexcavation layback, or landscape slopes.  Just make sure your surfaces are freshly built before you start.

Create Surface Tie, Select the Layer you want the new surface tie to be in, Select the surface that you want to tie in to, Select the reference line and direction, maximum spacing, and then fill in your desired cut/fill slopes (you can opt between a slope percent and ratio using the drop downs). 

This will create a new surface tie surface.  In some cases, it may be appropriate to explode the surface tie so that you can incorporate this linework into a FD surface or specific machine surface model.

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Anthony Dalla
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